Với $t_{i}\in \left [ 0,\,1 \right ]$ thì:
$$\frac{{t_{1}}^{2}+ {t_{2}}^{2}}{1+ {t_{1}}^{2}{t_{2}}^{2}}\leqq \left ( t_{1}+ t_{2}- t_{1}t_{2} \right )^{2}$$
Với $t_{i}\in \left [ 0,\,1 \right ]$ thì:
$$\frac{{t_{1}}^{2}+ {t_{2}}^{2}}{1+ {t_{1}}^{2}{t_{2}}^{2}}\leqq \left ( t_{1}+ t_{2}- t_{1}t_{2} \right )^{2}$$
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